First Measurement of Near- and Sub-Threshold $J/\psi$ Photoproduction off Nuclei - INSPIRE

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First Measurement of Near- and Sub-Threshold $J/\psi$ Photoproduction off Nuclei

Sep 27, 2024

e-Print:

2409.18463 [nucl-ex]

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Abstract: (arXiv)

We report on the first measurement of

J/\psi

photoproduction from nuclei in the photon energy range of

7

to

10.8

GeV, extending above and below the photoproduction threshold in the free proton of

\sim8.2

GeV. The experiment used a tagged photon beam incident on deuterium, helium, and carbon, and the GlueX detector at Jefferson Lab to measure the semi-inclusive

A(\gamma,e^+e^-p)

reaction with a dilepton invariant mass

M(e^+e^-)\sim m_{J/\psi}=3.1

GeV. The incoherent

J/\psi

photoproduction cross sections in the measured nuclei are extracted as a function of the incident photon energy, momentum transfer, and proton reconstructed missing light-cone momentum fraction. Comparisons with theoretical predictions assuming a dipole form factor allow extracting a gluonic radius for bound protons of

\sqrt{\langle r^2\rangle}=0.85\pm0.14

fm. The data also suggest an excess of the measured cross section for sub-threshold production and for interactions with high missing light-cone momentum fraction protons. The measured enhancement can be explained by modified gluon structure for high-virtuality bound-protons.

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